ZnS@C/rGO复合材料的制备及其电化学可逆储锂性能  

Preparation of ZnS@C/rGO Composite for Electrochemical Reversible Lithium Storage

作　　者：徐刚 姜孝男 陈卫祥[1] XU Gang;JIANG Xiao-Nan;CHEN Wei-Xiang(Department of Chemistry,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学化学系,杭州310027

出　　处：《无机化学学报》2022年第5期891-900,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21473156);浙江省科技厅科技计划重点项目(No.2015C01001)资助。

摘　　要：通过溶剂热反应-水热处理的途径,制备了无定形碳包覆的ZnS纳米晶体(ZnS@C)与还原氧化石墨烯(rGO)复合的ZnS@C/rGO复合材料,并用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)对复合材料进行了形貌和微观结构的表征。电化学测试结果表明,与ZnS@C和ZnS/rGO相比,所制备的ZnS@C/rGO复合材料显示了显著增强的电化学储锂性能,在100 mA·g^(-1)电流密度下,其电化学储锂的首次可逆比容量为1101 mAh·g^(-1),充放电循环100次后其可逆比容量为1569 mAh·g^(-1)。在不同电流密度下循环1200次后,仍保持在2.0 A·g^(-1)电流密度下有1096 mAh·g^(-1)的可逆比容量,显示了其稳定的长循环性能。ZnS@C/reduce graphene oxide(rGO)composite was prepared by solvothermal reaction-hydrothermal treatment route.ZnS nanocrystal coated by amorphous carbon(ZnS@C)was prepared by the first-step solvothermal reaction,then ZnS@C/rGO was prepared by the second-step hydrothermal treatment.The morphology and microstructure of samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).Electrochemical test results demonstrated that the as-prepared ZnS@C/rGO composite exhibited significantly enhanced electrochemical lithium storage performance in comparison to ZnS@C and ZnS/rGO.At the current density of 100 mA·g^(-1),ZnS@C/rGO electrode delivered the reversible specific capacity of 1101 mAh·g^(-1)and 1569 mAh·g^(-1),respectively,at the 1st and 100th cycle.After 1200 cycles at the different current densities,the reversible specific capacity of 1096 mAh·g^(-1)was remained at 2.0 A·g^(-1),indicating its stable long-cycle performance.

关 键 词：锂离子电池 溶剂热反应 水热处理 无定形碳 还原氧化石墨烯 

分 类 号：O646.21[理学—物理化学] O613.71[理学—化学]